<!DOCTYPE html>
<html>
<head>
</head>

<body>

<div style="float:left; width:10px; height:500px; background:blue; display: block;"></div>

<div style="float:right; height: 100px; width: 20px; background: red;"></div>

<div>
  <div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange;"></div>
  asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf
</div>

</body>
</html>